CVE-2026-67214
nanoid (Nano ID) before 3.3.16 and 5.1.16 contains an infinite loop in the customAlphabet and nanoid functions of its non-secure module (nanoid/non-secure). When these functions are given a negative size, the loop counter is decremented from a negative value and never reaches its termination condition, spinning indefinitely and hanging the calling thread. An application that passes an unvalidated, attacker-controlled negative size to these functions is exposed to a denial-of-service condition.
- Published Jul 29, 2026
- CVSS 8.2 high
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Affected software
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